<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>登录</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
    <link rel="stylesheet" th:href="@{~/css/dlcss.css}" type="text/css">
</head>
<body>
<div class="header" id="head">
    <div class="title">企业办公系统</div>

</div>

<div class="wrap" id="wrap">
    <div class="logGet">
        <!-- 头部提示信息 -->
        <div class="logD logDtip">
            <p class="p1">登录</p>
        </div>
        <!-- 输入框 -->
        <div class="lgD">

            <img src="img/logPwd.png" width="20" height="20" alt=""/>
            <input type="text"
                   placeholder="输入用户名" />
        </div>
        <div class="lgD">
            <img src="img/logPwd.png" width="20" height="20" alt=""/>
            <input type="text"
                   placeholder="输入用户密码" />
        </div>
        <div class="lgD">
        <label>验证码:</label>
        <div id="v_container" style="width: 200px;height: 50px;"></div>
        <input type="text" id="code_input" value="" placeholder="请输入验证码"/>
        </div>
        <script>
            !(function(window, document) {
                function GVerify(options) { //创建一个图形验证码对象，接收options对象为参数
                    this.options = { //默认options参数值
                        id: "", //容器Id
                        canvasId: "verifyCanvas", //canvas的ID
                        width: "100", //默认canvas宽度
                        height: "30", //默认canvas高度
                        type: "blend", //图形验证码默认类型blend:数字字母混合类型、number:纯数字、letter:纯字母
                        code: ""
                    }

                    if(Object.prototype.toString.call(options) == "[object Object]"){//判断传入参数类型
                        for(var i in options) { //根据传入的参数，修改默认参数值
                            this.options[i] = options[i];
                        }
                    }else{
                        this.options.id = options;
                    }

                    this.options.numArr = "0,1,2,3,4,5,6,7,8,9".split(",");
                    this.options.letterArr = getAllLetter();

                    this._init();
                    this.refresh();
                }

                GVerify.prototype = {
                    /**版本号**/
                    version: '1.0.0',

                    /**初始化方法**/
                    _init: function() {
                        var con = document.getElementById(this.options.id);
                        var canvas = document.createElement("canvas");
                        this.options.width = con.offsetWidth > 0 ? con.offsetWidth : "100";
                        this.options.height = con.offsetHeight > 0 ? con.offsetHeight : "30";
                        canvas.id = this.options.canvasId;
                        canvas.width = this.options.width;
                        canvas.height = this.options.height;
                        canvas.style.cursor = "pointer";
                        canvas.innerHTML = "您的浏览器版本不支持canvas";
                        con.appendChild(canvas);
                        var parent = this;
                        canvas.onclick = function(){
                            parent.refresh();
                        }
                    },

                    /**生成验证码**/
                    refresh: function() {
                        this.options.code = "";
                        var canvas = document.getElementById(this.options.canvasId);
                        if(canvas.getContext) {
                            var ctx = canvas.getContext('2d');
                        }else{
                            return;
                        }

                        ctx.textBaseline = "middle";

                        ctx.fillStyle = randomColor(180, 240);
                        ctx.fillRect(0, 0, this.options.width, this.options.height);

                        if(this.options.type == "blend") { //判断验证码类型
                            var txtArr = this.options.numArr.concat(this.options.letterArr);
                        } else if(this.options.type == "number") {
                            var txtArr = this.options.numArr;
                        } else {
                            var txtArr = this.options.letterArr;
                        }

                        for(var i = 1; i <= 4; i++) {
                            var txt = txtArr[randomNum(0, txtArr.length)];
                            this.options.code += txt;
                            ctx.font = randomNum(this.options.height/2, this.options.height) + 'px SimHei'; //随机生成字体大小
                            ctx.fillStyle = randomColor(50, 160); //随机生成字体颜色
                            ctx.shadowOffsetX = randomNum(-3, 3);
                            ctx.shadowOffsetY = randomNum(-3, 3);
                            ctx.shadowBlur = randomNum(-3, 3);
                            ctx.shadowColor = "rgba(0, 0, 0, 0.3)";
                            var x = this.options.width / 5 * i;
                            var y = this.options.height / 2;
                            var deg = randomNum(-30, 30);
                            /**设置旋转角度和坐标原点**/
                            ctx.translate(x, y);
                            ctx.rotate(deg * Math.PI / 180);
                            ctx.fillText(txt, 0, 0);
                            /**恢复旋转角度和坐标原点**/
                            ctx.rotate(-deg * Math.PI / 180);
                            ctx.translate(-x, -y);
                        }
                        /**绘制干扰线**/
                        for(var i = 0; i < 4; i++) {
                            ctx.strokeStyle = randomColor(40, 180);
                            ctx.beginPath();
                            ctx.moveTo(randomNum(0, this.options.width), randomNum(0, this.options.height));
                            ctx.lineTo(randomNum(0, this.options.width), randomNum(0, this.options.height));
                            ctx.stroke();
                        }
                        /**绘制干扰点**/
                        for(var i = 0; i < this.options.width/4; i++) {
                            ctx.fillStyle = randomColor(0, 255);
                            ctx.beginPath();
                            ctx.arc(randomNum(0, this.options.width), randomNum(0, this.options.height), 1, 0, 2 * Math.PI);
                            ctx.fill();
                        }
                    },

                    /**验证验证码**/
                    validate: function(code){
                        var code = code.toLowerCase();
                        var v_code = this.options.code.toLowerCase();
                        console.log(v_code);
                        if(code == v_code){
                            return true;
                        }else{
                            this.refresh();
                            return false;
                        }
                    }
                }
                /**生成字母数组**/
                function getAllLetter() {
                    var letterStr = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
                    return letterStr.split(",");
                }
                /**生成一个随机数**/
                function randomNum(min, max) {
                    return Math.floor(Math.random() * (max - min) + min);
                }
                /**生成一个随机色**/
                function randomColor(min, max) {
                    var r = randomNum(min, max);
                    var g = randomNum(min, max);
                    var b = randomNum(min, max);
                    return "rgb(" + r + "," + g + "," + b + ")";
                }
                window.GVerify = GVerify;
            })(window, document);
        </script>
        <script>
            var verifyCode = new GVerify("v_container");

            document.getElementById("my_button").onclick = function(){
                var res = verifyCode.validate(document.getElementById("code_input").value);
                if(res){
                    alert("验证正确");
                }else{
                    alert("验证码错误");
                }
            }
        </script>
        <table>
            <tr>
            </tr>
        </table>
        <div class="logC">
            <a href="index.html" target="_self"><button>登 录</button></a>
        </div>
    </div>
</div>

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    <div class="copyright">
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            <i class="icon"></i><span>联系邮箱：923704371@qq.com</span>
        </div>

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            <i class="icon1"></i><span>联系地址：富荣大厦209六号桌一号位</span>
        </div>

        <div class="img">
            <i class="icon2"></i><span>联系电话：18578369115</span>
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